Articles | Volume 15, issue 22
https://doi.org/10.5194/bg-15-6761-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-15-6761-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
14 Nov 2018
Research article |
| 14 Nov 2018
| 14 Nov 2018
The effect of salinity on the biogeochemistry of the coccolithophores with implications for coccolith-based isotopic proxies
Michaël Hermoso
CORRESPONDING AUTHOR
Sorbonne Université, CNRS-INSU, Institut des Sciences de la
Terre de Paris, 75005 Paris, France
Marceau Lecasble
Sorbonne Université, CNRS-INSU, Institut des Sciences de la
Terre de Paris, 75005 Paris, France
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This study explores the impact of environmental conditions on the chemistry of coccoliths, calcite minerals produced by marine algae, to better understand past climate changes. By cultivating different species of coccolithophores under various CO2 and pH levels, we have shown that the isotopic composition of certain species varies with CO2 concentration and quantified these variations.
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This study explores the impact of environmental conditions on the chemistry of coccoliths, calcite minerals produced by marine algae, to better understand past climate changes. By cultivating different species of coccolithophores under various CO2 and pH levels, we have shown that the isotopic composition of certain species varies with CO2 concentration and quantified these variations.
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Clim. Past, 18, 449–464, https://doi.org/10.5194/cp-18-449-2022, https://doi.org/10.5194/cp-18-449-2022, 2022
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We test a new method to reconstruct past atmospheric CO2 levels based on the geochemistry of pelagic algal biominerals (coccoliths), which recent culture and numerical experiments have related to ambient CO2 concentrations. By comparing the isotopic composition of fossil coccoliths to the inferred surface ocean CO2 level at the time they calcified, we outline a transfer function and argue that coccolith vital effects can be used to reconstruct geological pCO2 beyond the ice core record.
M. Hermoso, I. Z. X. Chan, H. L. O. McClelland, A. M. C. Heureux, and R. E. M. Rickaby
Biogeosciences, 13, 301–312, https://doi.org/10.5194/bg-13-301-2016, https://doi.org/10.5194/bg-13-301-2016, 2016
M. Hermoso, D. Delsate, F. Baudin, L. Le Callonnec, F. Minoletti, M. Renard, and A. Faber
Solid Earth, 5, 793–804, https://doi.org/10.5194/se-5-793-2014, https://doi.org/10.5194/se-5-793-2014, 2014
M. Hermoso, F. Minoletti, and P. Pellenard
Clim. Past, 9, 2703–2712, https://doi.org/10.5194/cp-9-2703-2013, https://doi.org/10.5194/cp-9-2703-2013, 2013
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Particulate organic nitrogen (PON) in the ocean refers to nitrogen contained in particles suspended such as phytoplankton, zooplankton, bacteria, viruses, and organic detritus. We used field measurements to determine relationships between PON and inherent optical properties of seawater across a broad range of marine environments. The presented relationships are expected to have application in the assessment of PON distribution and variations from in situ and satellite optical observations
Rosie M. Sheward, Christina Gebühr, Jörg Bollmann, and Jens O. Herrle
Biogeosciences, 21, 3121–3141, https://doi.org/10.5194/bg-21-3121-2024, https://doi.org/10.5194/bg-21-3121-2024, 2024
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Laura Marín-Samper, Javier Arístegui, Nauzet Hernández-Hernández, Joaquín Ortiz, Stephen D. Archer, Andrea Ludwig, and Ulf Riebesell
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Our planet is facing a climate crisis. Scientists are working on innovative solutions that will aid in capturing the hard to abate emissions before it is too late. Exciting research reveals that ocean alkalinity enhancement, a key climate change mitigation strategy, does not harm phytoplankton, the cornerstone of marine ecosystems. Through meticulous study, we may have uncovered a positive relationship: up to a specific limit, enhancing ocean alkalinity boosts photosynthesis by certain species.
France Van Wambeke, Pascal Conan, Mireille Pujo-Pay, Vincent Taillandier, Olivier Crispi, Alexandra Pavlidou, Sandra Nunige, Morgane Didry, Christophe Salmeron, and Elvira Pulido-Villena
Biogeosciences, 21, 2621–2640, https://doi.org/10.5194/bg-21-2621-2024, https://doi.org/10.5194/bg-21-2621-2024, 2024
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Jenny Hieronymus, Magnus Hieronymus, Matthias Gröger, Jörg Schwinger, Raffaele Bernadello, Etienne Tourigny, Valentina Sicardi, Itzel Ruvalcaba Baroni, and Klaus Wyser
Biogeosciences, 21, 2189–2206, https://doi.org/10.5194/bg-21-2189-2024, https://doi.org/10.5194/bg-21-2189-2024, 2024
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The timing of the net primary production annual maxima in the North Atlantic in the period 1750–2100 is investigated using two Earth system models and the high-emissions scenario SSP5-8.5. It is found that, for most of the region, the annual maxima occur progressively earlier, with the most change occurring after the year 2000. Shifts in the seasonality of the primary production may impact the entire ecosystem, which highlights the need for long-term monitoring campaigns in this area.
Nicole M. Travis, Colette L. Kelly, and Karen L. Casciotti
Biogeosciences, 21, 1985–2004, https://doi.org/10.5194/bg-21-1985-2024, https://doi.org/10.5194/bg-21-1985-2024, 2024
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We conducted experimental manipulations of light level on microbial communities from the primary nitrite maximum. Overall, while individual microbial processes have different directions and magnitudes in their response to increasing light, the net community response is a decline in nitrite production with increasing light. We conclude that while increased light may decrease net nitrite production, high-light conditions alone do not exclude nitrification from occurring in the surface ocean.
Zoë Rebecca van Kemenade, Zeynep Erdem, Ellen Christine Hopmans, Jaap Smede Sinninghe Damsté, and Darci Rush
Biogeosciences, 21, 1517–1532, https://doi.org/10.5194/bg-21-1517-2024, https://doi.org/10.5194/bg-21-1517-2024, 2024
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The California Current system (CCS) hosts the eastern subtropical North Pacific oxygen minimum zone (ESTNP OMZ). This study shows anaerobic ammonium oxidizing (anammox) bacteria cause a loss of bioavailable nitrogen (N) in the ESTNP OMZ throughout the late Quaternary. Anammox occurred during both glacial and interglacial periods and was driven by the supply of organic matter and changes in ocean currents. These findings may have important consequences for biogeochemical models of the CCS.
Cathy Wimart-Rousseau, Tobias Steinhoff, Birgit Klein, Henry Bittig, and Arne Körtzinger
Biogeosciences, 21, 1191–1211, https://doi.org/10.5194/bg-21-1191-2024, https://doi.org/10.5194/bg-21-1191-2024, 2024
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The marine CO2 system can be measured independently and continuously by BGC-Argo floats since numerous pH sensors have been developed to suit these autonomous measurements platforms. By applying the Argo correction routines to float pH data acquired in the subpolar North Atlantic Ocean, we report the uncertainty and lack of objective criteria associated with the choice of the reference method as well the reference depth for the pH correction.
Sabine Mecking and Kyla Drushka
Biogeosciences, 21, 1117–1133, https://doi.org/10.5194/bg-21-1117-2024, https://doi.org/10.5194/bg-21-1117-2024, 2024
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This study investigates whether northeastern North Pacific oxygen changes may be caused by surface density changes in the northwest as water moves along density horizons from the surface into the subsurface ocean. A correlation is found with a lag that about matches the travel time of water from the northwest to the northeast. Salinity is the main driver causing decadal changes in surface density, whereas salinity and temperature contribute about equally to long-term declining density trends.
Allanah Joy Paul, Mathias Haunost, Silvan Urs Goldenberg, Jens Hartmann, Nicolás Sánchez, Julieta Schneider, Niels Suitner, and Ulf Riebesell
EGUsphere, https://doi.org/10.5194/egusphere-2024-417, https://doi.org/10.5194/egusphere-2024-417, 2024
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Ocean alkalinity enhancement (OAE) is being assessed for its potential to absorb atmospheric CO2 and store it for a long time. OAE still needs comprehensive assessment of its safety and effectiveness. We studied an idealised OAE application in a natural low nutrient ecosystem over one month. Our results showed that biogeochemical functioning remained mostly stable, but that the long-term capability for storing carbon may be limited at high alkalinity concentration.
Takamitsu Ito, Hernan E. Garcia, Zhankun Wang, Shoshiro Minobe, Matthew C. Long, Just Cebrian, James Reagan, Tim Boyer, Christopher Paver, Courtney Bouchard, Yohei Takano, Seth Bushinsky, Ahron Cervania, and Curtis A. Deutsch
Biogeosciences, 21, 747–759, https://doi.org/10.5194/bg-21-747-2024, https://doi.org/10.5194/bg-21-747-2024, 2024
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This study aims to estimate how much oceanic oxygen has been lost and its uncertainties. One major source of uncertainty comes from the statistical gap-filling methods. Outputs from Earth system models are used to generate synthetic observations where oxygen data are extracted from the model output at the location and time of historical oceanographic cruises. Reconstructed oxygen trend is approximately two-thirds of the true trend.
Robert W. Izett, Katja Fennel, Adam C. Stoer, and David P. Nicholson
Biogeosciences, 21, 13–47, https://doi.org/10.5194/bg-21-13-2024, https://doi.org/10.5194/bg-21-13-2024, 2024
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This paper provides an overview of the capacity to expand the global coverage of marine primary production estimates using autonomous ocean-going instruments, called Biogeochemical-Argo floats. We review existing approaches to quantifying primary production using floats, provide examples of the current implementation of the methods, and offer insights into how they can be better exploited. This paper is timely, given the ongoing expansion of the Biogeochemical-Argo array.
Qian Liu, Yingjie Liu, and Xiaofeng Li
Biogeosciences, 20, 4857–4874, https://doi.org/10.5194/bg-20-4857-2023, https://doi.org/10.5194/bg-20-4857-2023, 2023
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In the Southern Ocean, abundant eddies behave opposite to our expectations. That is, anticyclonic (cyclonic) eddies are cold (warm). By investigating the variations of physical and biochemical parameters in eddies, we find that abnormal eddies have unique and significant effects on modulating the parameters. This study fills a gap in understanding the effects of abnormal eddies on physical and biochemical parameters in the Southern Ocean.
Caroline Ulses, Claude Estournel, Patrick Marsaleix, Karline Soetaert, Marine Fourrier, Laurent Coppola, Dominique Lefèvre, Franck Touratier, Catherine Goyet, Véronique Guglielmi, Fayçal Kessouri, Pierre Testor, and Xavier Durrieu de Madron
Biogeosciences, 20, 4683–4710, https://doi.org/10.5194/bg-20-4683-2023, https://doi.org/10.5194/bg-20-4683-2023, 2023
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Deep convection plays a key role in the circulation, thermodynamics, and biogeochemical cycles in the Mediterranean Sea, considered to be a hotspot of biodiversity and climate change. In this study, we investigate the seasonal and annual budget of dissolved inorganic carbon in the deep-convection area of the northwestern Mediterranean Sea.
Daniela König and Alessandro Tagliabue
Biogeosciences, 20, 4197–4212, https://doi.org/10.5194/bg-20-4197-2023, https://doi.org/10.5194/bg-20-4197-2023, 2023
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Using model simulations, we show that natural and anthropogenic changes in the global climate leave a distinct fingerprint in the isotopic signatures of iron in the surface ocean. We find that these climate effects on iron isotopes are often caused by the redistribution of iron from different external sources to the ocean, due to changes in ocean currents, and by changes in algal growth, which take up iron. Thus, isotopes may help detect climate-induced changes in iron supply and algal uptake.
Chloé Baumas, Robin Fuchs, Marc Garel, Jean-Christophe Poggiale, Laurent Memery, Frédéric A. C. Le Moigne, and Christian Tamburini
Biogeosciences, 20, 4165–4182, https://doi.org/10.5194/bg-20-4165-2023, https://doi.org/10.5194/bg-20-4165-2023, 2023
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Through the sink of particles in the ocean, carbon (C) is exported and sequestered when reaching 1000 m. Attempts to quantify C exported vs. C consumed by heterotrophs have increased. Yet most of the conducted estimations have led to C demands several times higher than C export. The choice of parameters greatly impacts the results. As theses parameters are overlooked, non-accurate values are often used. In this study we show that C budgets can be well balanced when using appropriate values.
Anna Belcher, Sian F. Henley, Katharine Hendry, Marianne Wootton, Lisa Friberg, Ursula Dallman, Tong Wang, Christopher Coath, and Clara Manno
Biogeosciences, 20, 3573–3591, https://doi.org/10.5194/bg-20-3573-2023, https://doi.org/10.5194/bg-20-3573-2023, 2023
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The oceans play a crucial role in the uptake of atmospheric carbon dioxide, particularly the Southern Ocean. The biological pumping of carbon from the surface to the deep ocean is key to this. Using sediment trap samples from the Scotia Sea, we examine biogeochemical fluxes of carbon, nitrogen, and biogenic silica and their stable isotope compositions. We find phytoplankton community structure and physically mediated processes are important controls on particulate fluxes to the deep ocean.
Asmita Singh, Susanne Fietz, Sandy J. Thomalla, Nicolas Sanchez, Murat V. Ardelan, Sébastien Moreau, Hanna M. Kauko, Agneta Fransson, Melissa Chierici, Saumik Samanta, Thato N. Mtshali, Alakendra N. Roychoudhury, and Thomas J. Ryan-Keogh
Biogeosciences, 20, 3073–3091, https://doi.org/10.5194/bg-20-3073-2023, https://doi.org/10.5194/bg-20-3073-2023, 2023
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Despite the scarcity of iron in the Southern Ocean, seasonal blooms occur due to changes in nutrient and light availability. Surprisingly, during an autumn bloom in the Antarctic sea-ice zone, the results from incubation experiments showed no significant photophysiological response of phytoplankton to iron addition. This suggests that ambient iron concentrations were sufficient, challenging the notion of iron deficiency in the Southern Ocean through extended iron-replete post-bloom conditions.
Benoît Pasquier, Mark Holzer, Matthew A. Chamberlain, Richard J. Matear, Nathaniel L. Bindoff, and François W. Primeau
Biogeosciences, 20, 2985–3009, https://doi.org/10.5194/bg-20-2985-2023, https://doi.org/10.5194/bg-20-2985-2023, 2023
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Modeling the ocean's carbon and oxygen cycles accurately is challenging. Parameter optimization improves the fit to observed tracers but can introduce artifacts in the biological pump. Organic-matter production and subsurface remineralization rates adjust to compensate for circulation biases, changing the pathways and timescales with which nutrients return to the surface. Circulation biases can thus strongly alter the system’s response to ecological change, even when parameters are optimized.
Priyanka Banerjee
Biogeosciences, 20, 2613–2643, https://doi.org/10.5194/bg-20-2613-2023, https://doi.org/10.5194/bg-20-2613-2023, 2023
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This study shows that atmospheric deposition is the most important source of iron to the upper northern Indian Ocean for phytoplankton growth. This is followed by iron from continental-shelf sediment. Phytoplankton increase following iron addition is possible only with high background levels of nitrate. Vertical mixing is the most important physical process supplying iron to the upper ocean in this region throughout the year. The importance of ocean currents in supplying iron varies seasonally.
Iris Kriest, Julia Getzlaff, Angela Landolfi, Volkmar Sauerland, Markus Schartau, and Andreas Oschlies
Biogeosciences, 20, 2645–2669, https://doi.org/10.5194/bg-20-2645-2023, https://doi.org/10.5194/bg-20-2645-2023, 2023
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Global biogeochemical ocean models are often subjectively assessed and tuned against observations. We applied different strategies to calibrate a global model against observations. Although the calibrated models show similar tracer distributions at the surface, they differ in global biogeochemical fluxes, especially in global particle flux. Simulated global volume of oxygen minimum zones varies strongly with calibration strategy and over time, rendering its temporal extrapolation difficult.
John C. Tracey, Andrew R. Babbin, Elizabeth Wallace, Xin Sun, Katherine L. DuRussel, Claudia Frey, Donald E. Martocello III, Tyler Tamasi, Sergey Oleynik, and Bess B. Ward
Biogeosciences, 20, 2499–2523, https://doi.org/10.5194/bg-20-2499-2023, https://doi.org/10.5194/bg-20-2499-2023, 2023
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Nitrogen (N) is essential for life; thus, its availability plays a key role in determining marine productivity. Using incubations of seawater spiked with a rare form of N measurable on a mass spectrometer, we quantified microbial pathways that determine marine N availability. The results show that pathways that recycle N have higher rates than those that result in its loss from biomass and present new evidence for anaerobic nitrite oxidation, a process long thought to be strictly aerobic.
Amanda Gerotto, Hongrui Zhang, Renata Hanae Nagai, Heather M. Stoll, Rubens César Lopes Figueira, Chuanlian Liu, and Iván Hernández-Almeida
Biogeosciences, 20, 1725–1739, https://doi.org/10.5194/bg-20-1725-2023, https://doi.org/10.5194/bg-20-1725-2023, 2023
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Based on the analysis of the response of coccolithophores’ morphological attributes in a laboratory dissolution experiment and surface sediment samples from the South China Sea, we proposed that the thickness shape (ks) factor of fossil coccoliths together with the normalized ks variation, which is the ratio of the standard deviation of ks (σ) over the mean ks (σ/ks), is a robust and novel proxy to reconstruct past changes in deep ocean carbon chemistry.
Katherine E. Turner, Doug M. Smith, Anna Katavouta, and Richard G. Williams
Biogeosciences, 20, 1671–1690, https://doi.org/10.5194/bg-20-1671-2023, https://doi.org/10.5194/bg-20-1671-2023, 2023
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We present a new method for reconstructing ocean carbon using climate models and temperature and salinity observations. To test this method, we reconstruct modelled carbon using synthetic observations consistent with current sampling programmes. Sensitivity tests show skill in reconstructing carbon trends and variability within the upper 2000 m. Our results indicate that this method can be used for a new global estimate for ocean carbon content.
Alexandre Mignot, Hervé Claustre, Gianpiero Cossarini, Fabrizio D'Ortenzio, Elodie Gutknecht, Julien Lamouroux, Paolo Lazzari, Coralie Perruche, Stefano Salon, Raphaëlle Sauzède, Vincent Taillandier, and Anna Teruzzi
Biogeosciences, 20, 1405–1422, https://doi.org/10.5194/bg-20-1405-2023, https://doi.org/10.5194/bg-20-1405-2023, 2023
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Numerical models of ocean biogeochemistry are becoming a major tool to detect and predict the impact of climate change on marine resources and monitor ocean health. Here, we demonstrate the use of the global array of BGC-Argo floats for the assessment of biogeochemical models. We first detail the handling of the BGC-Argo data set for model assessment purposes. We then present 23 assessment metrics to quantify the consistency of BGC model simulations with respect to BGC-Argo data.
Alban Planchat, Lester Kwiatkowski, Laurent Bopp, Olivier Torres, James R. Christian, Momme Butenschön, Tomas Lovato, Roland Séférian, Matthew A. Chamberlain, Olivier Aumont, Michio Watanabe, Akitomo Yamamoto, Andrew Yool, Tatiana Ilyina, Hiroyuki Tsujino, Kristen M. Krumhardt, Jörg Schwinger, Jerry Tjiputra, John P. Dunne, and Charles Stock
Biogeosciences, 20, 1195–1257, https://doi.org/10.5194/bg-20-1195-2023, https://doi.org/10.5194/bg-20-1195-2023, 2023
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Ocean alkalinity is critical to the uptake of atmospheric carbon and acidification in surface waters. We review the representation of alkalinity and the associated calcium carbonate cycle in Earth system models. While many parameterizations remain present in the latest generation of models, there is a general improvement in the simulated alkalinity distribution. This improvement is related to an increase in the export of biotic calcium carbonate, which closer resembles observations.
Jérôme Pinti, Tim DeVries, Tommy Norin, Camila Serra-Pompei, Roland Proud, David A. Siegel, Thomas Kiørboe, Colleen M. Petrik, Ken H. Andersen, Andrew S. Brierley, and André W. Visser
Biogeosciences, 20, 997–1009, https://doi.org/10.5194/bg-20-997-2023, https://doi.org/10.5194/bg-20-997-2023, 2023
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Large numbers of marine organisms such as zooplankton and fish perform daily vertical migration between the surface (at night) and the depths (in the daytime). This fascinating migration is important for the carbon cycle, as these organisms actively bring carbon to depths where it is stored away from the atmosphere for a long time. Here, we quantify the contributions of different animals to this carbon drawdown and storage and show that fish are important to the biological carbon pump.
Alastair J. M. Lough, Alessandro Tagliabue, Clément Demasy, Joseph A. Resing, Travis Mellett, Neil J. Wyatt, and Maeve C. Lohan
Biogeosciences, 20, 405–420, https://doi.org/10.5194/bg-20-405-2023, https://doi.org/10.5194/bg-20-405-2023, 2023
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Iron is a key nutrient for ocean primary productivity. Hydrothermal vents are a source of iron to the oceans, but the size of this source is poorly understood. This study examines the variability in iron inputs between hydrothermal vents in different geological settings. The vents studied release different amounts of Fe, resulting in plumes with similar dissolved iron concentrations but different particulate concentrations. This will help to refine modelling of iron-limited ocean productivity.
Nicole M. Travis, Colette L. Kelly, Margaret R. Mulholland, and Karen L. Casciotti
Biogeosciences, 20, 325–347, https://doi.org/10.5194/bg-20-325-2023, https://doi.org/10.5194/bg-20-325-2023, 2023
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The primary nitrite maximum is a ubiquitous upper ocean feature where nitrite accumulates, but we still do not understand its formation and the co-occurring microbial processes involved. Using correlative methods and rates measurements, we found strong spatial patterns between environmental conditions and depths of the nitrite maxima, but not the maximum concentrations. Nitrification was the dominant source of nitrite, with occasional high nitrite production from phytoplankton near the coast.
Natacha Le Grix, Jakob Zscheischler, Keith B. Rodgers, Ryohei Yamaguchi, and Thomas L. Frölicher
Biogeosciences, 19, 5807–5835, https://doi.org/10.5194/bg-19-5807-2022, https://doi.org/10.5194/bg-19-5807-2022, 2022
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Compound events threaten marine ecosystems. Here, we investigate the potentially harmful combination of marine heatwaves with low phytoplankton productivity. Using satellite-based observations, we show that these compound events are frequent in the low latitudes. We then investigate the drivers of these compound events using Earth system models. The models share similar drivers in the low latitudes but disagree in the high latitudes due to divergent factors limiting phytoplankton production.
Abigale M. Wyatt, Laure Resplandy, and Adrian Marchetti
Biogeosciences, 19, 5689–5705, https://doi.org/10.5194/bg-19-5689-2022, https://doi.org/10.5194/bg-19-5689-2022, 2022
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Marine heat waves (MHWs) are a frequent event in the northeast Pacific, with a large impact on the region's ecosystems. Large phytoplankton in the North Pacific Transition Zone are greatly affected by decreased nutrients, with less of an impact in the Alaskan Gyre. For small phytoplankton, MHWs increase the spring small phytoplankton population in both regions thanks to reduced light limitation. In both zones, this results in a significant decrease in the ratio of large to small phytoplankton.
Margot C. F. Debyser, Laetitia Pichevin, Robyn E. Tuerena, Paul A. Dodd, Antonia Doncila, and Raja S. Ganeshram
Biogeosciences, 19, 5499–5520, https://doi.org/10.5194/bg-19-5499-2022, https://doi.org/10.5194/bg-19-5499-2022, 2022
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We focus on the exchange of key nutrients for algae production between the Arctic and Atlantic oceans through the Fram Strait. We show that the export of dissolved silicon here is controlled by the availability of nitrate which is influenced by denitrification on Arctic shelves. We suggest that any future changes in the river inputs of silica and changes in denitrification due to climate change will impact the amount of silicon exported, with impacts on Atlantic algal productivity and ecology.
Cited articles
Aloisi, G.: Covariation of metabolic rates and cell size in coccolithophores,
Biogeosciences, 12, 4665–4692, https://doi.org/10.5194/bg-12-4665-2015,
2015.
Antonov, J. I., Seidov, D., Boyer, T. P., Locarnini, R. ., Mishonov, A. V.,
Garcia, H. E., Baranova, O. K., Zweng, M. M., and Johnson, D. R.: World Ocean
Atlas 2009 (Volume 2: Salinity), U.S. Gov., edited by: Levitus, S., Washinton
D.C., 2010.
Benetti, M., Reverdin, G., Aloisi, G., and Sveinbjörnsdóttir, Á.:
Stable isotopes in surface waters of the Atlantic Ocean: Indicators of
ocean-atmosphere water fluxes and oceanic mixing processes, J. Geophys.
Res.-Oceans, 122, 4723–4742, https://doi.org/10.1002/2017JC012712, 2017.
Bolton, C. T. and Stoll, H. M.: Late Miocene threshold response of marine
algae to carbon dioxide limitation, Nature, 500, 558–562,
https://doi.org/10.1038/nature12448, 2013.
Brand, L. E.: The salinity tolerance of forty-six marine phytoplankton
isolates, Estuar. Coast. Shelf S., 18, 543–556,
https://doi.org/10.1016/0272-7714(84)90089-1, 1984.
Candelier, Y., Minoletti, F., Probert, I., and Hermoso, M.: Temperature
dependence of oxygen isotope fractionation in coccolith calcite: A culture
and core top calibration of the genus Calcidiscus, Geochim.
Cosmochim. Ac., 100, 264–281, https://doi.org/10.1016/j.gca.2012.09.040, 2013.
Dudley, W., Blackwelder, P., Brand, L., and Duplessy, J.-C.: Stable isotopic
composition of coccoliths, Mar. Micropaleontol., 10, 1–8, 1986.
Fielding, S. R., Herrle, J. O., Bollmann, J., Worden, R. H., and Montagnes,
D. J. S.: Assessing the applicability of Emiliania huxleyi coccolith
morphology as a sea-surface salinity proxy, Limnol. Oceanogr., 54,
1475–1480, https://doi.org/10.4319/lo.2009.54.5.1475, 2009.
Fisher, N. S. and Honjo, S.: Intraspecific Differences in Temperature and
Salinity Responses in the Coccolithophore Emiliania huxleyi, Biol.
Oceanogr., 6, 355–361, 1989.
Hermoso, M.: Coccolith-derived isotopic proxies in palaeoceanography: Where
geologists need biologists, Cryptogamie Algol., 35, 323–351,
https://doi.org/10.7872/crya.v35.iss4.2014.323, 2014.
Hermoso, M.: Control of ambient pH on growth and stable isotopes in
phytoplanktonic calcifying algae, Paleoceanography, 30, PA002844,
https://doi.org/10.1002/2015PA002844, 2015.
Hermoso, M.: Isotopic record of Pleistocene glacial/interglacial cycles in
pelagic carbonates: Revisiting historical data from the Caribbean Sea,
Quaternary Sci. Rev., 137, 69–78, https://doi.org/10.1016/j.quascirev.2016.02.003, 2016.
Hermoso, M.: Changes in growth parameters of cultured coccolithophores and
isotopic composition of coccolith calcite with salinity, PANGAEA,
https://doi.pangaea.de/10.1594/PANGAEA.895777, 2018.
Hermoso, M. and Minoletti, F.: Mass and Fine-Scale Morphological Changes
Induced by Changing Seawater pH in the Coccolith Gephyrocapsa oceanica, J. Geophys. Res.-Biogeo., 123, 2761–2774,
https://doi.org/10.1029/2018JG004535, 2018.
Hermoso, M., Horner, T. J., Minoletti, F., and Rickaby, R. E. M.: Constraints
on the vital effect in coccolithophore and dinoflagellate calcite by oxygen
isotopic modification of seawater, Geochim. Cosmochim. Ac., 44, 612–627,
https://doi.org/10.1016/j.gca.2014.05.002, 2014.
Hermoso, M., Candelier, Y., Browning, T. J. T. J., and Minoletti, F.:
Environmental control of the isotopic composition of subfossil coccolith
calcite: Are laboratory culture data transferable to the natural
environment?, GeoResJ, 7, 35–42, https://doi.org/10.1016/j.grj.2015.05.002, 2015.
Hermoso, M., Minoletti, F., Aloisi, G., Bonifacie, M., McClelland, H. L. O.,
Labourdette, N., Renforth, P., Chaduteau, C., and Rickaby, R. E. M.: An
explanation for the 18O excess in Noelaerhabdaceae coccolith
calcite, Geochim. Cosmochim. Ac., 189, 132–142,
https://doi.org/10.1016/j.gca.2016.06.016, 2016a.
Hermoso, M., Chan, I. Z. X., McClelland, H. L. O., Heureux, A. M. C., and
Rickaby, R. E. M.: Vanishing coccolith vital effects with alleviated carbon
limitation, Biogeosciences, 13, 301–312,
https://doi.org/10.5194/bg-13-301-2016, 2016b.
Hermoso, M., Lefeuvre, B., Minoletti, F., and de Rafélis, M.: Extreme
strontium concentrations reveal specific biomineralization pathways in
certain coccolithophores with implications for the Sr/Ca paleoproductivity
proxy, PLoS One, 12, e0185655, https://doi.org/10.1371/journal.pone.0185655, 2017.
Holtz, L.-M., Wolf-Gladrow, D., and Thoms, S.: Numerical cell model
investigating cellular carbon fluxes in Emiliania huxleyi, J. Theor.
Biol., 364, 305–315, https://doi.org/10.1016/j.jtbi.2014.08.040, 2015.
Katz, A., Bonifacie, M., Hermoso, M., Cartigny, P., and Calmels, D.:
Laboratory-grown coccoliths exhibit no vital effect in clumped isotope
(Δ47) composition on a range of geologically relevant temperatures,
Geochim. Cosmochim. Ac., 208, 335–353, https://doi.org/10.1016/j.gca.2017.02.025, 2017.
Keller, M. D., Selvin, R. C., Claus, W., and Guillard, R. R. L.: Media for
the culture of oceanic ultraphytoplankton, J. Phycol., 23, 633–638,
https://doi.org/10.1111/j.1529-8817.1987.tb04217.x, 1987.
Kim, S.-T. and O'Neil, J. R.: Equilibrium and nonequilibrium oxygen isotope
effects in synthetic carbonates, Geochim. Cosmochim. Ac., 61, 3461–3475,
https://doi.org/10.1016/S0016-7037(97)00169-5, 1997.
Kirst, G. O.: Salinity Tolerance of Eukaryotic Marine Algae, Annu. Rev. Plant
Phys., 41, 21–53, https://doi.org/10.1146/annurev.pp.41.060190.000321, 1990.
Laroche, J., Rost, B., and Engel, A.: Guide to best practices for ocean
acidification research and data reporting, in: Part 2: Experimental design of
perturbation experiments Bioassays, batch culture and chemostat
experimentation, edited by: Riebesell, U., Fabry, V. J., Hansson, L., and
Gattuso, J.-P., Publications Office of the European, Luxembourg, 81–94,
2010.
LeGrande, A. N. and Schmidt, G. A.: Global gridded data set of the oxygen
isotopic composition in seawater, Geophys. Res. Lett., 33, L12604,
https://doi.org/10.1029/2006GL026011, 2006.
McClelland, H. L. O., Bruggeman, J., Hermoso, M., and Rickaby, R. E. M.: The
origin of carbon isotope vital effects in coccolith calcite, Nat. Commun., 8,
14511, https://doi.org/10.1038/ncomms14511, 2017.
Paasche, E., Brubak, S., Skattebøl, S., Young, J. R., and Green, J. C.:
Growth and calcification in the coccolithophorid Emiliania huxleyi
(Haptophyceae) at low salinities, Phycologia, 35, 394–403,
https://doi.org/10.2216/i0031-8884-35-5-394.1, 1996.
Racapé, V., Monaco, L., Metzl, N., and Pierre, C.: Summer and winter
distribution of δ13CDIC in surface waters of the South Indian Ocean
[20∘ S–60∘ S], Tellus B, 62, 660–673,
https://doi.org/10.1111/j.1600-0889.2010.00504.x, 2010.
Rickaby, R. E. M., Henderiks, J., and Young, J. N.: Perturbing phytoplankton:
response and isotopic fractionation with changing carbonate chemistry in two
coccolithophore species, Clim. Past, 6, 771–785,
https://doi.org/10.5194/cp-6-771-2010, 2010.
Rickaby, R. E. M., Hermoso, M., Lee, R. B. Y., Rae, B. D., Heureux, A. M. C.,
Balestreri, C., Chakravarti, L., Schroeder, D. C., and Brownlee, C.:
Environmental carbonate chemistry selects for phenotype of recently isolated
strains of Emiliania huxleyi, Deep-Sea Res. Pt. II, 127, 28–40,
https://doi.org/10.1016/j.dsr2.2016.02.010, 2016.
Robbins, L. L., Hansen, M. E., Kleypas, J. A., and Meylan, S. C.:
CO2calc – A user-friendly seawater carbon calculator for Windows,
Max OS X, and iOS (iPhone), U.S. Geol. Surv. – File Rep., 1280, 2010.
Rohling, E. J. and Bigg, G. R.: Paleosalinity and δ18O: A
critical assessment, J. Geophys. Res.-Oceans, 103, 1307–1318,
https://doi.org/10.1029/97JC01047, 1998.
Romanek, C. S., Morse, J. W., and Grossman, E. L.: Carbon isotopic
fractionation in synthetic aragonite and calcite: Effects of temperature and
precipitation rate, Geochim. Cosmochim. Ac., 56, 419–430, 1992.
Rostek, F., Ruhlandt, G., Bassinot, F. C., Muller, P. J., Labeyrie, L. D.,
Lancelot, Y., and Bard, E.: Reconstructing sea surface temperature and
salinity using δ18O andalkenone records, Nature, 364,
319–321, https://doi.org/10.1038/364319a0, 1993.
Sarmiento, J. and Gruber, N.: Ocean Biogeochemical Dynamics, Princeton.,
edited by: Sarmiento, J. and Gruber, N., Princeton University Press, Oxford,
2006.
Saruwatari, K., Satoh, M., Harada, N., Suzuki, I., and Shiraiwa, Y.: Change
in coccolith size and morphology due to response to temperature and salinity
in coccolithophore Emiliania huxleyi (Haptophyta) isolated from the
Bering and Chukchi seas, Biogeosciences, 13, 2743–2755,
https://doi.org/10.5194/bg-13-2743-2016, 2016.
Schmidt, M. W., Spero, H. J., and Lea, D. W.: Links between salinity
variation in the Caribbean and North Atlantic thermohaline circulation,
Nature, 428, 160–163, https://doi.org/10.1038/nature02346, 2004.
Schouten, S., Ossebaar, J., Schreiber, K., Kienhuis, M. V. M., Langer, G.,
Benthien, A., and Bijma, J.: The effect of temperature, salinity and growth
rate on the stable hydrogen isotopic composition of long chain alkenones
produced by Emiliania huxleyi and Gephyrocapsa oceanica,
Biogeosciences, 3, 113–119, https://doi.org/10.5194/bg-3-113-2006, 2006.
Stevenson, E. I., Hermoso, M., Rickaby, R. E. M., Tyler, J. J., Minoletti,
F., Parkinson, I. J., Mokadem, F., and Burton, K. W.: Controls on Stable
strontium isotope fractionation in coccolithophores with implications for the
marine Sr cycle, Geochim. Cosmochim. Ac., 128, 225–235,
https://doi.org/10.1016/j.gca.2013.11.043, 2014.
Thornalley, D. J. R., Elderfield, H., and McCave, I. N.: Holocene
oscillations in temperature and salinity of the surface subpolar North
Atlantic, Nature, 457, 711–714, https://doi.org/10.1038/nature07717, 2009.
Tremblin, M., Hermoso, M., and Minoletti, F.: Equatorial heat accumulation as
a long-term trigger of permanent Antarctic ice-sheets during the Cenozoic, P.
Natl. Acad. Sci. USA, 113, 11782–11787, https://doi.org/10.1073/pnas.1608100113, 2016.
Watkins, J. M., Nielsen, L. C., Ryerson, F. J., and DePaolo, D. J.: The
influence of kinetics on the oxygen isotope composition of calcium carbonate,
Earth Planet. Sc. Lett., 375, 349–360, https://doi.org/10.1016/j.epsl.2013.05.054, 2013.
Wit, J. C., de Nooijer, L. J., Wolthers, M., and Reichart, G. J.: A novel
salinity proxy based on Na incorporation into foraminiferal calcite,
Biogeosciences, 10, 6375–6387, https://doi.org/10.5194/bg-10-6375-2013,
2013.
Zachos, J., Pagani, M., Sloan, L., Thomas, E., and Billups, K.: Trends,
rhythms, and aberrations in global climate 65 Ma to present., Science, 292,
686–693, https://doi.org/10.1126/science.1059412, 2001.
Zeebe, R. E. and Wolf-Gladrow: CO2 in Seawater: Equilibrium,
Kinetics, Isotopes, Elsevier, 2001.
Ziveri, P., Stoll, H., Probert, I., Klaas, C., Geisen, M., Ganssen, G., and
Young, J.: Stable isotope “vital effects” in coccolith calcite, Earth Planet.
Sc. Lett., 210, 137–149, https://doi.org/10.1016/S0012-821X(03)00101-8, 2003.
Short summary
This work examines the effect of salinity changes on the biogeochemistry of the coccolithophores with a palaeoproxy perspective. Although substantial changes in growth rate are observed between cells grown under various salinities, these physiological changes have no significant impact on the oxygen isotope composition of their biominerals. Thus, established coccolith δ18O / temperature calibrations are not complicated by salinity. By contrast, it does influence coccolith δ13C values.
This work examines the effect of salinity changes on the biogeochemistry of the coccolithophores...
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